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Diodes Incorporated AH3968-WT-7
- Part No.:
- AH3968-WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AH3968-WT-7.pdf
- Description:
- HALL LATCH SWITCH TSOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
AH3968-WT-7 from Diodes Incorporated is a dual Hall-effect latch IC delivering two independent open-drain speed outputs (Q1 and Q2) for precise bidirectional rotation sensing in harsh industrial environments. It operates from 2.7V to 27V, features chopper-stabilized architecture for ±5 µs output jitter and <±30 G magnetic offset, and includes Zener clamp (36 V), UVLO (2.35 V typ), and HBM ESD protection (5 kV). Used in motor commutation feedback loops requiring robust direction-agnostic speed capture.
For engineers reviewing the AH3968-WT-7 datasheet, AH3968-WT-7 pinout, AH3968-WT-7 application, or AH3968-WT-7 equivalent, this page delivers verified functional role, TSOT25 package mapping, dual-output timing behavior, magnetic switch-point stability across -40°C to +125°C, and direct alternatives for speed-sensing system redesigns.
Technical Context
The AH3968 integrates two independent Hall plates (H1 and H2) with separate signal paths, each feeding a chopper-stabilized amplifier, sample-and-hold circuit, and open-drain output driver - enabling simultaneous, uncorrelated Q1 and Q2 switching without shared hysteresis or propagation delay coupling. Its dual-latch architecture supports quadrature decoding when paired with magnet pole-pairs spaced at mechanical half-pitch.
Internal bandgap regulation supplies temperature-compensated bias to all analog blocks, while the UVLO circuit freezes output states below 2.35 V to prevent metastable transitions during brownout. The reverse-blocking diode and 36 V Zener clamp protect against supply transients up to ±18 V reverse voltage and 40 V surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 27 V - Enables direct connection to 3.3 V, 5 V, 12 V, and 24 V industrial rails without external regulators. |
| Output Type | Two independent open-drain outputs (Q1, Q2) - Allows separate pull-up resistors and logic-level interfacing to microcontrollers or gate drivers. |
| Operating Temperature | -40°C to +125°C - Qualified for under-hood automotive auxiliary systems and industrial motor control enclosures. |
| Magnetic Switch Points | Q1/Q2 BOP: 50–100 G, BRP: -100 to -50 G - Supports reliable detection of small-diameter magnets or high-air-gap configurations. |
| Output Timing | tD = 13 µs max response delay, tDC = 50–1000 ns count signal delay - Enables accurate RPM measurement up to 60 kHz (120 kpps) with minimal phase error. |
| ESD Robustness | HBM = 5 kV, CDM = 2 kV - Survives handling and board-level ESD events without latch-up or parameter shift. |
| UVLO Threshold | 2.35 V typical - Prevents erroneous output toggling during power-rail sag below valid logic threshold. |
Pinout & Package
TSOT25 (Type A1) surface-mount package: 2.9 mm × 2.8 mm × 0.8 mm body, matte tin-plated leads, moisture sensitivity level 1, 0.016 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Primary supply input - Accepts 2.7–27 V; internal Zener clamp activates above 36 V. |
| 2 | GND | Analog/digital ground reference - Dual GND pins (2 & 3) reduce ground bounce in noisy motor-drive environments. |
| 3 | GND | Second ground terminal - Low-inductance return path for Hall plate bias and output discharge current. |
| 4 | Q2 | Speed Output 2 - Open-drain, 50 mA sink capability; active-low when H2 detects magnetic field exceeding BOP. |
| 5 | Q1 | Speed Output 1 - Independent open-drain output synchronized to H1; enables differential speed comparison or redundancy. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent Hall latches | Enables true parallel speed acquisition from two spatially separated magnetic targets - eliminates sequential sampling latency. |
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to ±0.35 G/°C and maintains <±5 µs jitter over full temperature range. |
| Zener clamp + reverse diode | Withstands -18 V reverse supply and 40 V transient surges - eliminates need for external TVS in 24 V systems. |
| Undervoltage lockout (UVLO) | Freezes Q1/Q2 state during VDD drop below 2.35 V - prevents false edge generation that corrupts encoder counts. |
| High ESD immunity | 5 kV HBM rating allows direct PCB handling and integration into unshielded industrial I/O modules. |
Applications
| Brushless DC Motor Commutation | Pump Speed Monitoring |
|---|---|
|
Use Scenario: Detecting rotor position in 3-phase BLDC motors using back-EMF-less sensor-based control. IC Role / Device Role / Timing Role: Q1 and Q2 provide asynchronous, low-jitter edges aligned to magnet pole transitions - used to generate six-step commutation timing windows. Use Value: Enables >60 kHz switching frequency operation with <13 µs total propagation delay, supporting high-RPM (>30,000 RPM) motor drives. |
Use Scenario: Real-time monitoring of centrifugal pump shaft speed in HVAC chillers and water circulation systems. IC Role / Device Role / Timing Role: Q1 captures leading-edge pulses from a single magnet on the impeller hub; Q2 monitors a second magnet for redundancy or direction verification. Use Value: Dual outputs allow cross-checking of rotational integrity - loss of one signal triggers fault reporting while maintaining speed calculation from the other. |
| Industrial Conveyor Belt Direction Detection | Linear Actuator Position Feedback |
|
Use Scenario: Determining forward/reverse motion of heavy-duty conveyor belts driven by AC induction motors with gearmotor reduction. IC Role / Device Role / Timing Role: Q1 and Q2 connected to adjacent Hall sensors placed 90° apart on a rotating sprocket - generating quadrature signals for direction and speed. Use Value: Magnetic matching tolerance <±30 G ensures consistent phase relationship between Q1/Q2 edges - eliminating direction ambiguity at startup or low speed. |
Use Scenario: Measuring stroke velocity and endpoint detection in electro-mechanical linear actuators used in factory automation grippers. IC Role / Device Role / Timing Role: Q1 tracks primary position marker; Q2 monitors secondary marker for absolute position interpolation or stall detection. Use Value: Independent output drivers support different pull-up voltages - Q1 interfaces to 3.3 V MCU, Q2 drives 24 V PLC input directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output Hall latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3425ELHLT-T | Single Hall latch with speed+direction outputs (SP/DIR), not dual independent outputs; 3.0–24 V supply; 100 kHz max fM. | Requires external logic to derive two speed signals; lacks Q1/Q2 isolation for redundant sensing. | Select when direction output is required alongside speed, and dual independent outputs are unnecessary. |
| MELEXIS US5881SEBAA-AAA-000-RE | Dual Hall latch with Q1/Q2 outputs but narrower supply (4.5–24 V); higher BOP (70–120 G); no integrated Zener clamp. | Needs external TVS for 24 V transient protection; less suitable for 3.3 V or battery-backed systems. | Select when operating exclusively above 4.5 V and external surge protection is already present. |
Compared with AH3968-WT-7, A3425 provides direction-aware output but sacrifices output independence and low-voltage operation, while US5881 offers tighter magnetic tolerance but requires external protection and excludes sub-4.5 V use - making AH3968 the only choice for wide-supply, dual-redundant speed sensing with integrated robustness.
Availability
AH3968-WT-7 is available at Aetrix Electronics and suitable for industrial motor control, pump monitoring, conveyor belt direction detection, and linear actuator feedback requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3968-WT-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial and automotive markets.
The AH396x family targets ruggedized rotational and linear motion sensing, with the AH3968 specifically engineered to replace mechanical switches and single-output Hall sensors in dual-channel speed-critical applications.
FAQ
What is the functional difference between AH3968 and AH3965/AH3966/AH3967?
AH3968 provides two independent open-drain speed outputs (Q1 and Q2), while AH3965–AH3967 deliver speed (SP) and direction (DIR) outputs in a single-channel configuration. AH3968's dual-latch architecture enables true parallel sensing without shared hysteresis or timing coupling - critical for redundancy, differential speed analysis, or quadrature decoding with external logic.
Can AH3968-WT-7 operate reliably at 3.3 V supply?
Yes - AH3968-WT-7 is fully specified down to 2.7 V supply, with guaranteed performance including 13 µs max response delay, 50 mA output sink, and ±5 µs jitter at 3.3 V. Its internal bandgap regulator ensures stable biasing across the entire 2.7–27 V range, making it compatible with both low-voltage microcontrollers and 24 V industrial buses.
How does the dual-GND pin configuration improve noise immunity?
Pins 2 and 3 are both GND terminals, providing separate low-inductance return paths: Pin 2 serves analog Hall plate and amplifier ground, while Pin 3 handles digital output driver ground. This separation minimizes ground bounce coupling from high-current output switching into sensitive magnetic sensing circuits - essential in motor-drive PCB layouts where dv/dt noise exceeds 100 V/µs.
Is AH3968-WT-7 qualified for automotive applications?
No - AH3968-WT-7 is an industrial-grade part rated for -40°C to +125°C ambient operation. For automotive use, Diodes offers the AH396XQ series (e.g., AH3968Q-WT-7), which undergoes AEC-Q100 qualification, includes enhanced ESD testing, and features automotive-specific marking and traceability - but shares identical electrical and magnetic specifications.
AH3968-WT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Latch, Dual
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 10mT Trip, -10mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 2.7V ~ 27V
- Current - Supply (Max):
- 7mA
- Current - Output (Max):
- 44mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25 (Type A1)
AH3968-WT-7 FAQ
1.How can I place an order for AH3968-WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3968-WT-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AH3968-WT-7 reliable?
The price and inventory of AH3968-WT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3968-WT-7 is usually 5 days.
3.What payment methods are accepted for AH3968-WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3968-WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3968-WT-7?
AH3968-WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3968-WT-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AH3968-WT-7?
For technical support, including AH3968-WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3968-WT-7 requirements.
6.How does Aetrix verify that AH3968-WT-7 is sourced from the original manufacturer or authorized distributors?
All AH3968-WT-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH3968-WT-7 meets industry standards.
7.What is the process for return or replacement of AH3968-WT-7?
All AH3968-WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3968-WT-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AH3968-WT-7 part is unused and in its original packaging.
Return procedure for AH3968-WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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